The average work done by a human heart

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Question:
The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart if it beats 72 times in a minute.

Solution:

P = WD/time

WD is one beat of heart = 0.5 J

WD in 72 beats = 36 J

P = WD/t = 0.6 W

The average work done by a human heart

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